Question

what is the action of pumping in laser​

Answer 1

Hi, Here is your answer

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Optical pumping is a process in which light is used to raise (or "pump") electrons from a lower energy level in an atom or molecule to a higher one. It is commonly used in laser construction, to pump the active laser medium so as to achieve population inversion.

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Answer 2

Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laseror an optical amplifier. The pumppower must be higher than the lasing threshold of the laser.